feat(nuxt): add nitro:build:public-assets hook

[danielroe]

🔗 Linked issue

resolves #14788

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds a new hook (nitro:build:assets) to allow interacting or adding new public assets after they have been copied into nitro.options.output.publicDir.

Thoughts welcome on hook name (cc: @pi0).

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[pi0]

LGTM 💯

[pi0]

Should we call it nitro:build:public hook? 🤔 (it is public assets)

[danielroe]

If you think that's clearer. Or maybe 'nitro:build:public-assets' if that's not too much of a mouthful?

[pi0]

I like clarity of full name 👍🏼